#pragma once
#include <string>
#include <iostream>

using namespace std;

class Mail {
public:
	int _id;
	std::string _content;
	std::string _sender;
	std::string _send_time;
public:
	Mail(int mail_id, const string& content, const string& sender, const string& send_time)
		:_id(mail_id), _content(content), _sender(sender), _send_time(send_time) {}
};

ostream& operator<<(ostream& os, const Mail& mail);